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By G. W. C. Milner, G. M. Phillips and R. J. Magee (Auth.)

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Extra info for Coulometry in Analytical Chemistry

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In a coulometer circuit the input to the motor is taken from the potential drop across a suitable resistor in series with the electrolysis cell. The basic circuit is shown in Fig. 7. c. source need not be as stable or as constant as those discussed previously, and this results in cheaper equipment. However, this is not an absolute method and the apparatus has to be calibrated either electrically with a precise constantcurrent source or chemically by coulometric titration of a known amount of an accepted standard.

27, 2 1 0 (1955). KESLER, R . , Analyt. Chem. 3 5 , 963 (1963). M O N K , R. G. and G O O D E , G. C , Talanta 1 0 , 5 1 (1963). COOKE, W . D . and F U R M A N , N . , Analyt. Chem. 2 2 , 896 (1950). CAC—C Analyt. CHAPTER 4 Equipment for Controlled-Potential Coulometry THE importance of potential control in effecting the desired reaction at an electrode in electrochemical analysis has been appreciated for many years. Sand,1 Fischer2 and Lassieur3 carried out pioneer investigations in controlled-potential electrolysis using manual control to maintain the potential of the cathode at a chosen value with respect to a standard reference electrode.

The circuit is capable of maintaining currents up to about 500 mA constant to within ± 0 · 05 %. c. supply voltage are compensated similarly. 6AS7 'V Rectifier circuits Ballast resistor and switching circuit o À' i S 90V y inconstant current Constant current FIG. 5. Mains-operated constant-current coulometric circuit of Reilley, Cooke and Furman. c. mains-operated instrument to keep currents up to 150 mA constant to within ±0-01 %. The circuit is shown in Fig. 5 and it has the following main features: CURRENT SOURCES 35 (1) a valve rectifier (type 5U4) with its associated smoothing circuit; (2) a ballast resistor consisting of a series of incandescent lamps L; (3) a voltage regulator circuit with valves of types 6SL7 and 6AS7.

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